Guide Bar for a Saw Chain of a Motor-Driven Chain Saw and Application of a Marking on a Guide Bar of a Motor-Driven Chain Saw

Abstract

A guide bar for a saw chain of a chain saw has a fastening section and a redirecting section. The guide bar has an imaginary longitudinal center axis extending from the fastening section to the redirecting section. The guide bar has at least one first marking in the form of a line. The first marking is inclined at an angle of about 20° to about 80° with respect to the longitudinal center axis when viewing the guide bar in side elevation. The first marking is used to estimate, during operation, the depth (t) of a groove produced by the saw chain in the workpiece in the case of a cut in which the longitudinal center axis of the guide bar is inclined at an angle of about 20° to about 80° to the surface of the workpiece.

1 - 17 . (canceled) 
     
     
         18 . A guide bar for a saw chain of a chain saw comprising:
 a guide bar body defining an imaginary longitudinal center axis and having a first end and a second end disposed opposite to said first end;   said first end having a fastening section;   said second end having a redirecting section;   said imaginary center line extending from said fastening section to said redirecting section; and,   at least one first marking having a linear shape and being inclined at an angle lying in a range of approximately 20° to approximately 80° with respect to said imaginary longitudinal center axis when said guide bar body is viewed in side elevation.   
     
     
         19 . The guide bar of  claim 18 , wherein:
 said guide bar body has a total length (a) and defines a forward region extending from said redirecting section over at most half of said total length (a); and,   said first marking is arranged in said forward region of said guide bar body.   
     
     
         20 . The guide bar of  claim 18  further comprising:
 a further first marking; and 
 said first marking and said further first marking being inclined with respect to one another. 
 
     
     
         21 . The guide bar of  claim 20 , wherein said first marking and said further first marking conjointly enclose an angle (h) lying in a range of approximately 5° to approximately 40°. 
     
     
         22 . The guide bar of  claim 20 , wherein said first marking and said further first marking intersect at said longitudinal center axis. 
     
     
         23 . The guide bar of  claim 20 , wherein:
 said first marking intersects said longitudinal center axis at a first intersection point;   said further first marking intersects said longitudinal center axis at a second intersection point; and,   said first intersection point is at a distance (w) from said second intersection point.   
     
     
         24 . The guide bar of  claim 18  further comprising:
 a second marking; and, 
 said first and said second marking being arranged in a mirror-symmetrical manner with respect to said longitudinal center axis. 
 
     
     
         25 . The guide bar of  claim 18  further comprising two first markings running parallel to each other. 
     
     
         26 . The guide bar of  claim 18  further comprising a second marking running perpendicular to said longitudinal center axis. 
     
     
         27 . The guide bar of  claim 18  further comprising a third marking which coincides with said longitudinal center axis. 
     
     
         28 . The guide bar of  claim 18 , wherein said first marking is indicated by a symbol. 
     
     
         29 . The guide bar of  claim 18 , wherein:
 said redirecting section defines a redirection radius (s);   said guide bar body has width (c) measured perpendicular to said longitudinal center axis; and,   said redirection radius (s) is less than 30% of the greatest value of said width (c).   
     
     
         30 . The guide bar of  claim 18 , wherein said first marking is configured as a recess in said guide bar body. 
     
     
         31 . Method of using a marking on a guide bar of a chain saw having a saw chain peripherally arranged about the guide bar, a drive motor configured to drive said saw chain, the guide bar having a fastening section at one end thereof and a redirecting section at the opposite end thereof, the guide bar defining an imaginary longitudinal center axis which extends from the fastening section to the redirecting section, the guide bar further having at least one first linearly shaped marking which, when viewing the guide bar in side elevation, is inclined at an angle (g) lying in a range of approximately 20° to approximately 80° with respect to the longitudinal center axis; the method comprising the steps of:
 during operation, using the first marking to estimate the depth (t) of a groove generated in a workpiece by the saw chain during a cut wherein the longitudinal center axis of the guide bar is inclined at an angle (q) lying in a range of approximately 20° to approximately 80° with respect to a surface of the workpiece. 
 
     
     
         32 . The method of  claim 31  further comprising the step of using the first marking to make a plurality of grooves having a depth corresponding to said depth (t). 
     
     
         33 . The method of  claim 31 , wherein the guide bar further has a symbol arranged on said first marking; and, wherein the symbol is used to estimate the depth (t) of a cut. 
     
     
         34 . The method of  claim 31 , wherein the guide bar has a further first marking which is inclined with respect to the first marking, wherein, during operation, the first marking and the further first marking are used to estimate the depth (t) of at least one groove generated in a workpiece when cutting wherein the longitudinal center axis of the guide bar is inclined at different angles (q, q′; r, r′) with respect to a surface of the workpiece.